Dual, 14-Bit, 1230 MSPS, TxDAC+ Digital-to-Analog Converter Data Sheet AD9121 The AD9121 TxDAC+ includes features optimized for direct FEATURES conversion transmit applications, including complex digital mod- Flexible LVDS interface allows word or byte load ulation, and gain and offset compensation. The DAC outputs Single-carrier W-CDMA ACLR = 82 dBc at 122.88 MHz IF are optimized to interface seamlessly with analog quadrature Analog output: adjustable 8.7 mA to 31.7 mA, modulators, such as the ADL537x F-MOD series from Analog R = 25 to 50 L Devices, Inc. A 4-wire serial port interface provides for program- Integrated 2/4/8 interpolator/complex modulator allows ming/readback of many internal parameters. Full-scale output carrier placement anywhere in the DAC bandwidth current can be programmed over a range of 8.7 mA to 31.7 mA. Gain, dc offset, and phase adjustment for sideband The AD9121 comes in a 72-lead LFCSP. suppression Multiple chip synchronization interfaces PRODUCT HIGHLIGHTS High performance, low noise PLL clock multiplier 1. Ultralow noise and intermodulation distortion (IMD) Digital inverse sinc filter enable high quality synthesis of wideband signals from Low power: 1.5 W at 1.2 GSPS, 800 mW at 500 MSPS, baseband to high intermediate frequencies (IF). full operating conditions 2. Proprietary DAC output switching technique enhances 72-lead, exposed paddle LFCSP dynamic performance. 3. Current outputs are easily configured for various single- APPLICATIONS ended or differential circuit topologies. Wireless infrastructure 4. Flexible LVDS digital interface allows the standard 28-wire W-CDMA, CDMA2000, TD-SCDMA, WiMAX, GSM, LTE bus to be reduced to one-half of the width. Digital high or low IF synthesis Transmit diversity COMPANION PRODUCTS Wideband communications: LMDS/MMDS, point-to-point IQ Modulators: ADL5370, ADL537x family GENERAL DESCRIPTION IQ Modulators with PLL and VCO: ADRF6701, ADRF670x family Clock Drivers: AD9516, AD951x family The AD9121 is a dual, 14-bit, high dynamic range digital-to- Voltage Regulator Design Tool: ADIsimPower analog converter (DAC) that provides a sample rate of 1230 MSPS, permitting multicarrier generation up to the Nyquist frequency. TYPICAL SIGNAL CHAIN COMPLEX BASEBAND COMPLEX IF RF f LO f DC IF IF 2 2/4 I DAC SIN DIGITAL ANTIALIASING PA BASEBAND AQM FILTER PROCESSOR COS 2 2/4 Q DAC LO AD9121 NOTES 1. AQM = ANALOG QUADRATURE MODULATOR. Figure 1. Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2012 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 09988-001AD9121* PRODUCT PAGE QUICK LINKS Last Content Update: 09/27/2017 COMPARABLE PARTS DESIGN RESOURCES View a parametric search of comparable parts. AD9121 Material Declaration PCN-PDN Information EVALUATION KITS Quality And Reliability AD9121 Evaluation Board Symbols and Footprints DOCUMENTATION DISCUSSIONS Data Sheet View all AD9121 EngineerZone Discussions. AD9121: Dual, 14-bit, 1230 MSPS, TxDAC+ Digital-to- Analog Converter SAMPLE AND BUY Visit the product page to see pricing options. REFERENCE MATERIALS Informational TECHNICAL SUPPORT Advantiv Advanced TV Solutions Submit a technical question or find your regional support Solutions Bulletins & Brochures number. Digital to Analog Converters ICs Solutions Bulletin DOCUMENT FEEDBACK Submit feedback for this data sheet. This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.